--- a/src/internet/model/tcp-newreno.cc	Thu Oct 02 21:05:15 2014 -0700
+++ b/src/internet/model/tcp-newreno.cc	Thu Oct 02 21:17:48 2014 -0700
@@ -50,10 +50,12 @@
                    MakeBooleanChecker ())
     .AddTraceSource ("CongestionWindow",
                      "The TCP connection's congestion window",
-                     MakeTraceSourceAccessor (&TcpNewReno::m_cWnd))
+                     MakeTraceSourceAccessor (&TcpNewReno::m_cWnd),
+                     "ns3::TracedValue::Uint32Callback")
     .AddTraceSource ("SlowStartThreshold",
                      "TCP slow start threshold (bytes)",
-                     MakeTraceSourceAccessor (&TcpNewReno::m_ssThresh))
+                     MakeTraceSourceAccessor (&TcpNewReno::m_ssThresh),
+                     "ns3::TracedValue::Uint32Callback")
  ;
   return tid;
 }